研究目的
To measure the point response function (PRF) of the CERES scanning radiometers, which describes the influence of radiance from each point on the measurement, and to compare the measured PRF with the theoretical PRF.
研究成果
The PRFs of the CERES protoflight model and the flight models FM-1 and FM-2 have been measured using the PRF source, and results have been reported. The PRFs for flight models FM-3 and FM-4, which are flying aboard the Aqua spacecraft, have been measured likewise. The measured PRF agreed well with the theoretical shape in each case. The centroid for each channel is located in agreement with design.
研究不足
The finite size of the PRF beam and the thermal radiation from the test chamber itself induce errors in PRF measurements. The total channel and longwave window channel measurements show effects due to temperature variations of the structure of the mask around the PRF source and the wall of the RCF.
1：Experimental Design and Method Selection:
A radiance source for the measurement of the PRF of the CERES instruments was built and installed into the Radiometric Calibration Facility. The design and application of the PRF source and the computation of the PRF from these measurements are described.
2：Sample Selection and Data Sources:
The PRF of each CERES channel is measured separately. The elevation scan axis of the instrument is oriented vertically, and the instrument scans past the source.
3：List of Experimental Equipment and Materials:
The PRF source includes a 2400-K Nernst glower, off-axis mirrors, a zinc selenide window, and a liquid-nitrogen-cooled shroud.
4：Experimental Procedures and Operational Workflow:
For each channel, the FOV midpoint at cross-scan angle =
5：0° is measured first. The cross-scan setting is step increased by +25° until reaching 5°. At each cross-scan step, mirror TF3 is used to adjust the along-scan angle of the source beam from -2°, 0°, and +2°. Data Analysis Methods:
The analysis of the measurements to produce the PRF is discussed, including accounting for the finite size of the PRF beam.
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